OpenKM has many interesting features, but requires some configuration process to show its full potential.

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Might configure tesseract ocr engine and upload the document again or ( mark the document to be reindexed or index the whole repository again -> before it let's focus in text extraction ).

Follow the steps described here to install and configure ocr engine, https://docs.openkm.com/kcenter/view/ok ... ngine.html , then upload a file and wait until the document be processed ( the documents go into a queue what you can check from Administration > Stats > pending text extraction queue ).